CN115449096A - Processing aid master batch and preparation method thereof - Google Patents
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- CN115449096A CN115449096A CN202110641693.2A CN202110641693A CN115449096A CN 115449096 A CN115449096 A CN 115449096A CN 202110641693 A CN202110641693 A CN 202110641693A CN 115449096 A CN115449096 A CN 115449096A
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/12—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2427/16—Homopolymers or copolymers of vinylidene fluoride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2429/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an alcohol, ether, aldehydo, ketonic, acetal, or ketal radical; Hydrolysed polymers of esters of unsaturated alcohols with saturated carboxylic acids; Derivatives of such polymer
- C08J2429/02—Homopolymers or copolymers of unsaturated alcohols
- C08J2429/04—Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
- C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
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Abstract
A processing aid master batch and a preparation method thereof, belonging to the technical field of polyethylene processing aids. In the prior art, although the processing aid added in the production process of metallocene polyethylene can improve the performance to a certain extent, the processing aid often has the problems of poor thermal stability, long effect exerting time and the like, so that the processing efficiency is low and the product quality is poor. 80 to 90 parts of low-density polyethylene resin, 10 to 20 parts of metallocene linear low-density polyethylene resin, 0.1 to 0.5 part of antioxidant and 0.5 to 1 part of processing aid are utilized; wherein the processing aid comprises 45 to 60 parts of fluoroelastomer, 35 to 55 parts of polyethylene glycol and 4736 parts of pumice powder and 5~6 parts of polyethylene glycol; the combination of the specific polyethylene resin and the processing aid can fully exert the respective characteristics of various components, ensure that the processing aid master batch has small influence on the transparency, impact resistance and pressure resistance of a polyethylene base material when being applied to the processing of films, coffins and the like, benefit and avoid harm, reduce the processing difficulty and improve the processing performance.
Description
Technical Field
A processing aid master batch and a preparation method thereof, belonging to the technical field of polyethylene processing aids.
Background
Metallocene polyethylene has excellent impact resistance, optical properties of films and the like, can be widely applied to various application fields such as films, pipes, bottle caps and the like, but has a narrow molecular weight distribution, so that the problem of melt fracture is easy to occur during high-speed processing. In order to improve the processability of metallocene polyethylene, blending polyethylene with wide molecular weight distribution or adding processing aid master batch is generally adopted. Of these, blending a broad molecular weight distribution polyethylene, while beneficial in improving processability, reduces the performance advantages of metallocene polyethylenes, thereby reducing the overall performance of the article. Because the addition amount of the processing aid master batch is less and the influence on the comprehensive performance is less, the processing performance of the metallocene polyethylene is improved by adopting the processing aid master batch at present.
In the prior art, a method using a fluoroelastomer as a processing aid exists, and the action mechanism of the method is as follows: during polymer processing, the fluoroelastomer can migrate to extrusion molds and other metal surfaces to provide lubrication, prevent mold blockage, and improve processability. The current commercialized fluoroelastomers are compounds mainly comprising fluoropolymers, but have large differences in the improvement effect on the processability of metallocene polyethylene, and often have the problems of poor thermal stability, long effect exertion time and the like, resulting in low processing efficiency and poor product quality.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art, and provides the processing aid master batch which has excellent thermal stability, effectively improves the processing performance of metallocene polyethylene and improves the production efficiency of the metallocene polyethylene and the preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the processing aid master batch is characterized in that: comprises the following components in parts by weight:
80 to 90 parts of low-density polyethylene resin, 10 to 20 parts of metallocene linear low-density polyethylene resin, 0.1 to 0.5 part of antioxidant and 0.5 to 1 part of processing aid;
wherein the processing aid comprises the following components in parts by weight: 45-60 parts of fluoroelastomer, 35-55 parts of polyethylene glycol and 8978 parts of pumice powder 5~6 parts;
the mass flow rate of the low-density polyethylene resin melt is 1 to 2g/10min;
the melt mass flow rate of the metallocene linear low-density polyethylene resin is 20 to 30g/10min.
The metallocene linear low-density polyethylene resin can improve the production of the master batch, reduce the cost, reduce the overall viscosity of the master batch, avoid the master batch from being adhered to the surface of processing equipment to be degraded when being mixed and applied and avoid impurities on the surface of a product; on the other hand, the metallocene linear low-density polyethylene resin added in the master batch is beneficial to the dispersion of the processing aid in the master batch and the dispersion of the master batch in the resin when the master batch is applied to the metallocene polyethylene resin, and meanwhile, the metallocene linear low-density polyethylene can be well compatible with the low-density polyethylene resin, which is equivalent to the dispersion aid effect among various components, reduces the processing difficulty, is easy to mix uniformly and improves the production efficiency. The limited solution flow speed of the low-density polyethylene resin and the metallocene linear low-density polyethylene resin can ensure that the two components are fully compatible and well dispersed, and the processing performance and the material uniformity are improved.
By combining the low-density polyethylene resin and the metallocene linear low-density polyethylene resin, the respective characteristics of the two components are fully exerted, and the processing aid master batch is ensured to have less influence on the transparency, impact resistance and pressure resistance of a polyethylene base material when being applied to the processing of films, pipes and the like, thereby benefiting and avoiding the harm, reducing the processing difficulty and improving the processing performance.
Preferably, the density of the metallocene linear low-density polyethylene resin is 0.90 to 0.95g/com 3 . The preferred density range ensures that the metallocene linear low density polyethylene resin has the above-mentioned melt flow rate and has good compatibility with the low density polyethylene resin.
Preferably, the thermal weight loss initial temperature of the processing aid is more than or equal to 400 ℃, and the final residue content is less than or equal to 5%; the thermal stability time is 260 ℃ and is more than or equal to 5min; the fluorine content is 10 to 15 percent.
The limitation of the thermal weight loss temperature and the content of residues can ensure that the elastomer contains enough effective components beneficial to processing on one hand, and can control the adverse effect of inorganic matters on later processing application on the other hand, such as the content of impurities in the final product can be reduced; fluorine content is an important condition for improving processability, and cost and process improvement can be combined by controlling the content.
Preferably, the antioxidant is a hindered phenol antioxidant or a phosphite antioxidant system. The preparation process of the master batch needs a high-temperature melting process, and the carrier resin polyethylene can be degraded or crosslinked under the action of heat, oxygen and the like during high-temperature melting, so that the structure is changed to influence the application performance. In order to avoid the influence caused by adverse factors such as heat, oxygen and the like in the preparation process of the master batch, an antioxidant needs to be added into a composition system to keep the stability of the resin to heat and oxygen; and meanwhile, black impurities can be prevented from being generated in the later period.
Preferably, the dosage of the antioxidant is 0.2 to 0.4 part.
Preferably, the composition comprises the following components in parts by weight: 85 parts of low-density polyethylene resin, 15 parts of metallocene linear low-density polyethylene resin, 0.3 part of antioxidant and 0.7 part of processing aid.
The preferable weight part composition can ensure that the low-density polyethylene and olefin resin, the metallocene linear low-density polyethylene resin and the processing aid are just matched with each other, has the best processing performance, and each component fully plays the role of the components.
Preferably, the processing aid comprises the following components in parts by weight: 55 parts of fluoroelastomer, 40 parts of polyethylene glycol and 5 parts of pumice powder.
The optimized dosage of the pumice powder can provide good thermal stability and dispersibility for the processing aid, and simultaneously avoid turbidity of a final material caused by surplus calcium.
Further preferably, the fluoroelastomer is a copolymer of vinylidene fluoride and hexafluoropropylene.
The preferred processing aid is more advantageous in ensuring thermal stability of the processing aid and compatibility of the different components.
The preparation method of any one of the processing aid masterbatches is characterized by comprising the following steps: the method comprises the following steps:
1) Grinding the low-density polyethylene resin and the metallocene linear low-density polyethylene resin into particles, and controlling the particle size to be 40-80 meshes;
2) Mixing the low-density polyethylene resin, the metallocene linear low-density polyethylene resin, the antioxidant and the processing aid according to the weight part ratio at 35 to 50 ℃;
3) And (5) sending out the master batch for granulation.
The low-density polyethylene resin and the metallocene linear low-density polyethylene resin are ground to be more favorable for mutual dispersion between the low-density polyethylene resin and the metallocene linear low-density polyethylene resin, and the particle size can realize the highest dispersion effect without damaging various resin structures and losing performance.
Further preferably, the particle size in step 1) is controlled to 60 mesh.
Further preferably, step 2) is performed by mixing at low speed for 2min and then at high speed for 3min.
Compared with the prior art, the invention has the beneficial effects that: by combining the low-density polyethylene resin with the metallocene linear low-density polyethylene resin and matching with the specific processing aid, the prepared processing aid master batch has good dispersion performance when being added into the production process of metallocene polyethylene, the metal adhesion in the processing process of metallocene polyethylene is reduced, the processing performance is improved, the production efficiency is improved, and the production cost is further reduced; the impurities introduced into the product are few, and the product has almost no influence on the superior performance of the product.
Detailed Description
The present invention is further illustrated by the following examples, example 2 being the best mode of carrying out the invention.
The ingredients in parts by weight of the processing aid masterbatch in the following examples are shown in Table 1 below, and the ingredients and parts by weight of the processing aid masterbatch are shown in Table 2 below.
Wherein, mLLDPE is metallocene linear low density polyethylene resin, LDPE is low density polyethylene resin, and the fluorine elastomer is vinylidene fluoride-hexafluoropropylene copolymer.
Wherein, a thermal weight loss curve of PPA is obtained through TGA, and the initial temperature of thermal weight loss and the final residue content can be obtained through combining software.
The thermal stability time testing method comprises the steps of putting the PPA into a glassware, heating under different temperature and time conditions, observing the change condition of the appearance color, and when the natural color turns yellow or black, the thermal stability is changed.
The fluorine content was measured using a fluorescence element analyzer.
The MFR test is carried out according to GB/T3682.1-2018, and the adopted load is 2.16kg;
density test was performed according to GB/T1033.1-2008.
Example 1
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components and parts by weight in table 2.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =20.0g/10 mm, density 0.920g/cm 3 ；
LDPE has MFR =1.0g/10mim and density 0.920g/cm 3 ；
The initial temperature of thermal weight loss of the processing aid is 415 ℃, the content of residues is 4.3%, the thermal stability time is 260 ℃,6min, and the fluorine content is 10.8%.
The preparation method of the processing aid master batch comprises the following steps
1) Grinding the low-density polyethylene resin and the metallocene linear low-density polyethylene resin into particles, controlling the particle size distribution to be 60 meshes, controlling the grinding temperature to be 80 ℃, and controlling the bulk density of the ground powder to be 0.5g/cm 3 ；
2) Adding the low-density polyethylene resin, the metallocene linear low-density polyethylene resin, the antioxidant and the processing aid into a high-speed stirrer according to the weight part ratio, and mixing at a low speed (500 rpm) for 2min and a high speed (1000 rpm) for 3min at 40 ℃;
3) And adding the uniformly mixed materials into a double-screw extruder, and melting, plasticizing, extruding and granulating. The granulation temperature is 170 to 190 ℃, and the maximum granulation temperature is 190 ℃; screw length to diameter ratio 25, no shear block in screw construction.
Example 2
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components and parts by weight in table 2.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =20.0g/10 mm, density 0.920g/cm 3 ；
LDPE has MFR =1.0g/10mim, density 0.920g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 435 ℃, the residue content is 3.0 percent, the thermal stability time is 260 ℃,10min, and the fluorine content is 12.9 percent.
A process aid masterbatch was prepared as in example 1.
Example 3
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components and parts by weight in table 2.
Wherein the mLLDPE is prepared from ethylene and hexene-1Copolymer, MFR =30.0g/10mim, density 0.915g/cm 3 ；
LDPE has MFR =1.5g/10mim and density 0.920g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 443 ℃, the content of residues is 1.8%, the thermal stability time is 260 ℃,13min, and the fluorine content is 12.1%.
A preparation method of a processing aid master batch is disclosed, wherein on the basis of an embodiment 1, the grinding temperature in the step 1) is set to 83 ℃, and the particle size distribution is controlled to 50 meshes; step 2), mixing at low speed for 1min and at high speed for 4min; and 3) setting the granulation temperature to be 160-180 ℃.
Example 4
The processing aid master batch comprises the following components in parts by weight in table 1, and the following components in parts by weight in table 2.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =25.0g/10mim, and density 0.918g/cm 3 ；
LDPE has MFR =2.0g/10mim and density 0.920g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 423 ℃, the content of residues is 3.8%, the thermal stability time is 260 ℃,7min, and the fluorine content is 14.2%.
A process aid masterbatch was prepared as in example 3.
Comparative example 1
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components and parts by weight in table 2.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =5.0g/10 mm, and density 0.933g/cm 3 ；
LDPE has MFR =0.3g/10mim and density 0.920g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 369 ℃, the content of residues is 3.8%, the thermal stability time is 260 ℃,7min, and the fluorine content is 14.2%.
A process aid masterbatch was prepared as in example 2.
Comparative example 2
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components and parts by weight in table 2.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =25.0g/10mim, and density 0.918g/cm 3 ；
LDPE has MFR =2.0g/10mim and density 0.920g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 423 ℃, the content of residues is 3.8%, the thermal stability time is 260 ℃,7min, and the fluorine content is 14.2%.
A preparation method of a processing aid master batch is characterized in that on the basis of example 1, the grinding temperature is set to be 90 ℃, and the particle size distribution is controlled to be 40 meshes.
Comparative example 3
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components in parts by weight in table 2, wherein polyvinyl alcohol is replaced by polyethylene wax.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =2.0g/10mim, and density is 0.920g/cm 3 ；
LDPE has MFR =2.0g/10mim and density 0.920g/cm 3 ；
The initial temperature of thermal weight loss of the processing aid is 351 ℃, the residue content is 7.8%, the thermal stability time is 260 ℃,2min and the fluorine content is 10.2%.
A process aid masterbatch was prepared as in example 2.
Comparative example 4
The processing aid master batch comprises the following components in parts by weight in table 1, and the processing aid components in parts by weight in table 2, wherein pumice powder is replaced by talcum powder.
Wherein the mLLDPE is a copolymer of ethylene and hexene-1, MFR =5.0g/10 mm, and density 0.933g/cm 3 ；
LDPE has MFR =0.1g/10mim and density 0.920g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 369 ℃, the content of residues is 3.8%, the thermal stability time is 260 ℃,7min, and the fluorine content is 14.2%.
Comparative example 5
A processing aid masterbatch, the processing aid components and parts by weight are as in example 1.
10 portions of LLDPE, 90 portions of HDPE and 0.5 portion of processing aid in the processing aid master batch0.15 part of antioxidant 1010 and 168 parts respectively. Wherein LLDPE is a copolymer of ethylene and butene-1, MFR =2.0g/10 mm, density 0.921g/cm 3 ；
HDPE having MFR =1.0g/10 mm, density 0.945g/cm 3 ；
The initial temperature of the thermal weight loss of the processing aid is 369 ℃, the content of residues is 3.8%, the thermal stability time is 260 ℃,7min, and the fluorine content is 14.2%.
TABLE 1 processing aid masterbatch Components
TABLE 2 processing aid Components
Performance testing
At 100 parts of mLLDPE resin (MFR =0.6g/10 mm, density 0.937 g/cm) 3 ) 10 parts of the processing aid master batch obtained in the embodiment 1~4 and the comparative example 1~4 are respectively added, the metallocene linear low-density polyethylene composition material is obtained after mixing and granulation, and a pipe is extruded by a pipe extruding machine at the temperature of 200 ℃, wherein the pipe specification is phi 20 x 2.0mm.
The number of impurities is judged by observing the number of black or yellow impurities in 1 coil of the pipe (300 meters);
the processing speed of the pipe refers to the highest processing speed which can be achieved when the pipe is extruded, and the pipe has smooth surface and stable forming;
the surface of the pipe becomes smooth, the surface is rough when the pipe is produced at the beginning, the surface of the pipe becomes smooth along with the improvement of the processing performance of the processing aid on the pipe material, and the time refers to the time when the surface of the pipe is changed from rough to smooth.
The results of the performance tests are shown in Table 3.
Table 3 results of performance testing
As can be seen from the above examples and comparative examples, the processing performance (production efficiency) of metallocene polyethylene is significantly improved by adding the processing aid masterbatch of the present invention, the amount of impurities is small, and leakage of pipe products in the application process due to the generation of impurities can be avoided.
The additive master batch of the invention is not limited to pipes, and other application fields such as films, cables and pipes can be improved on the basis when in use.
The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (10)
1. A process aid masterbatch, characterized in that: comprises the following components in parts by weight:
80 to 90 parts of low-density polyethylene resin, 10 to 20 parts of metallocene linear low-density polyethylene resin, 0.1 to 0.5 part of antioxidant and 0.5 to 1 part of processing aid;
wherein the processing aid comprises the following components in parts by weight: 45-60 parts of fluoroelastomer, 35-55 parts of polyethylene glycol and 8978 parts of pumice powder 5~6 parts;
the mass flow rate of the low-density polyethylene resin melt is 1 to 2g/10min;
the melt mass flow rate of the metallocene linear low-density polyethylene resin is 20 to 30g/10min.
2. The process aid masterbatch of claim 1, wherein: the density of the metallocene linear low-density polyethylene resin is 0.90 to 0.95g/com 3 。
3. The process aid masterbatch of claim 1, wherein: the thermal weight loss initial temperature of the processing aid is more than or equal to 400 ℃, and the final residue content is less than or equal to 5%; the thermal stability time is 260 ℃ and is more than or equal to 5min; the fluorine content is 10 to 15 percent.
4. The process aid masterbatch of claim 1, wherein: the antioxidant is one or a mixture of two of hindered phenol antioxidant and phosphite antioxidant in any proportion.
5. The process aid masterbatch of claim 1, wherein: the dosage of the antioxidant is 0.2 to 0.4 part.
6. The process aid masterbatch of claim 1, wherein: the polyethylene comprises, by weight, 85 parts of low-density polyethylene resin, 15 parts of metallocene linear low-density polyethylene resin, 0.3 part of antioxidant and 0.7 part of processing aid.
7. The process aid masterbatch of claim 1, wherein: the processing aid comprises the following components in parts by weight: 55 parts of fluoroelastomer, 40 parts of polyethylene glycol and 5 parts of pumice powder.
8. The method of making a process aid masterbatch of any one of claims 1~7 wherein: the method comprises the following steps:
1) Grinding the low-density polyethylene resin and the metallocene linear low-density polyethylene resin into particles, and controlling the particle size to be 40-80 meshes;
2) Mixing the low-density polyethylene resin, the metallocene linear low-density polyethylene resin, the antioxidant and the processing aid according to the weight part ratio at 35 to 50 ℃;
3) And (5) sending out the master batch for granulation.
9. The process for preparing a process aid masterbatch according to claim 8, wherein: the grain diameter of the step 1) is controlled to be 60 meshes.
10. The process for preparing a process aid masterbatch according to claim 8, wherein: and 2) firstly mixing at low speed for 2min and then mixing at high speed for 3min.
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